How do religious institutions today of any denomination demonstrate either simplicity or wealth?

The religious institution demonstrate simplicity by encouraging people to follow the testimony of simplicity and to have a simple lifestyle.

Explanation:

The religious institutions of the Christianity religion state that simplicity is the theme of the religion. People should have a simple living style and should only focus on the things which are important for them in their lives.

They should not pay much attention to the things which are not very important in life. According to St. Thomas, god is infinitely simple and so should be his people. Thus religion encourage the people to follow the testimony of simplicity.